<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/react.development.js"></script>
    <script src="../js/react-dom.development.js"></script>
    <script src="../js/babel.min.js"></script>
    <script src="../js/prop-types.js"></script>
</head>

<body>
    <div id="test"></div>

    <script type="text/babel">
        class Demo extends React.Component{
            render(){
                return(
                    <div>
                        <input type="text" ref='input1'/>
                        <br />
                        <button onClick={this.show}>点我提示左侧数据</button>
                        <br />
                        <input ref='input2' type="text" onBlur={this.show2} placeholder='失去焦点提示数据'/>
                    </div>
                )
            }
            show=()=>{
                // alert(document.getElementById('input1').value)
                console.log(this);
                // alert(this.refs.input1.value);
                // const {refs:{input:{value:a}}}=this
                const {input1}=this.refs
                console.log(input1.value);
            }
            show2=()=>{
                const {input2} = this.refs
                alert(input2.value)
            }
        }
        ReactDOM.render(<Demo/>,document.getElementById('test'))
    </script>
</body>

</html>